Block copolymer microspheres with controlled surface nanostructures = 블록공중합체 마이크로입자의 표면 구조 제어에 대한 연구

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Using emulsion droplets to confine block copolymer (BCP) solutions in water, BCP colloidal particles can be produced, as the solvent in the emulsion droplets evaporates. The nanostructures of these particles are unique and can be controlled by changing the volume fraction of blocks, the particle size, and the interfacial tension between each of the blocks and the particle interface. In this study, BCP microspheres containing spherical BCP micelles are produced from an evaporative oil-in-water-emulsion. After then, the surface nanostructures of the microspheres are controlled under different external environments. First, Gold-decorated block copolymer microspheres (BCP-microspheres) displaying various surface morphologies were prepared by the infiltration of Au precursors into polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) micro-spheres in Chapter 2. The microspheres were fabricated by emulsifying the PS-b-P4VP polymers in chloro-form into a surfactant solution in water, followed by the evaporation of chloroform. The selective swelling of the P4VP domains in the microspheres by the Au precursor under acidic conditions resulted in the formation of Au-decorated BCP-microspheres with various surface nanostructures. As evidenced by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) measurements, dotted surface patterns were formed when microspheres smaller than 800 nm were synthesized, whereas fingerprint-like surface patterns were observed with microspheres larger than 800 nm. Au nanoparticles (NPs) were located inside P4VP domains near the surfaces of the prepared microspheres, as confirmed by TEM. The optical properties of the BCP-microspheres were characterized using UV-Vis absorption spectroscopy and fluorescence lifetime measurements. A maximum absorption peak was observed at approximately 580 nm, indicating that Au NPs are densely packed into P4VP domains on the microspheres. Our approach for creating Au-NP-hybrid BCP-microspheres...
Advisors
Kim, Bum-Joonresearcher김범준
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2014
Identifier
568533/325007  / 020105028
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2014.2, [ vi, 70 p. ]

Keywords

Block Copolymer Microsphere; 멤브레인 액적화; 균일한 마이크로입자; 표면 나노구조; 폴리스타이렌-폴리바이닐피리딘 블록공중합체; 블록공중합체 마이크로 입자; Polystyrene-b-poly(4-vinylpyridine); Surface Nanostructure; Monodisperse Microsphere; Membrane Emulsification

URI
http://hdl.handle.net/10203/196383
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=568533&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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